package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.service.UserWrapBatchService;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Resource
    private UserMapper userMapper;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.如果不符合，返回错误信息
            return Result.fail("手机格式错误");
        }
        //3.符合，生成验证码
        String code = RandomUtil.randomNumbers(6);
//        //4.保存验证码到session
//        session.setAttribute("code", code);

        //4.保存验证码到redis,设置一个有效期，内存--

        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone,
                code, LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //6.发送验证码
        log.debug("发送短信验证码成功，验证码：" + code);
        //返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.如果不符合，返回错误信息
            return Result.fail("手机格式错误");
        }
        //redis获取验证码

        //2.校验验证码
        Object cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
//        Object cacheCode = session.getAttribute("code");
        String code = loginForm.getCode();
        if(cacheCode == null || !cacheCode.toString().equals(code)){
            //3.不一致，报错
            return Result.fail("验证码错误");
        }
        //4.一致，根据手机号查询用户
        User user = query().eq("phone", phone).one();

        //5.判断用户是否存在
        if (user == null) {
            //6.不存在，创建新用户并保存
            user = createUserWithPhone(phone);
        }

//        //7.保存用户信息到session
//        session.setAttribute("user", BeanUtil.copyProperties(user, UserDTO.class));

        //7.保存用户信息到redis中
        //7.1 随机生成token作为登录令牌
        String token = UUID.randomUUID().toString(true);
        //7.2 将user对象转为Hash存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        //redis 是string  ，long转string报错，手动转
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,
                new HashMap<>(), CopyOptions.create().setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, filedValue) -> filedValue.toString()));
        //7.3 存储
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey, userMap);
        //7.4 设置token有效期
        stringRedisTemplate.expire(tokenKey, LOGIN_USER_TTL, TimeUnit.MINUTES);
        return Result.ok(token);
    }

    @Override
    public Map<String, User> queryUserByIdBatchQueue(List<UserWrapBatchService.Request> userReqs) {
        // 全部参数
        List<Long> userIds = userReqs.stream().map(UserWrapBatchService.Request::getUserId).distinct().collect(Collectors.toList());
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        // 用in语句合并成一条SQL，避免多次请求数据库的IO
        queryWrapper.in("id", userIds);
        List<User> users = userMapper.selectList(queryWrapper);
        Map<Long, List<User>> userGroup = users.stream().collect(Collectors.groupingBy(User::getId));
        HashMap<String, User> result = new HashMap<>();
        // 数据分组
        userReqs.forEach(val -> {
            List<User> usersList = userGroup.get(val.getUserId());
            if (!CollectionUtils.isEmpty(usersList)) {
                result.put(val.getRequestId(), usersList.get(0));
            } else {
                // 表示没数据 , 这里要new，不然加入队列会空指针
                result.put(val.getRequestId(), new User());
            }
        });
        return result;
    }

    private User createUserWithPhone(String phone) {
        //1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        //2.保存用户
        save(user);
        return user;
    }
}
